What's with Vitamin B12?

I have read almost every post in these forum and found out that most vegans have 1 common problem, It is about Vitamin b12. I just wonder how much vitamin b12 do we need a day and how much of what do we need to eat in order to meet it’s RDA.

Here is a good explanation of why we need b12 and how much we need. vegansociety.com/lifestyle/n … n/b12.aspx

Thank you so much sixfingered… Now, I will find the answer to my questions… Thanks a lot… :wink: